Analytical modelling of hydrogen transport in reactor containments
There are two diffusion processes, molecular and turbulent, which should be modelled in different ways. Molecular diffusion is modelled by Wilke's formula for the multi-component gas diffusion, where the diffusion constants are dependent on the relative concentrations. Turbulent diffusion is ba...
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Cambridge, Mass. : Massachusetts Institute of Technology, Energy Laboratory and Department of Nuclear Engineering, 1983
2011
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| Online Access: | http://hdl.handle.net/1721.1/60620 |
| _version_ | 1811094683424653312 |
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| author | Manno, V. Golay, M. |
| author2 | Massachusetts Institute of Technology. Energy Laboratory. |
| author_facet | Massachusetts Institute of Technology. Energy Laboratory. Manno, V. Golay, M. |
| author_sort | Manno, V. |
| collection | MIT |
| description | There are two diffusion processes, molecular and turbulent, which should be modelled in different ways. Molecular diffusion is modelled by Wilke's formula for the multi-component gas diffusion, where the diffusion constants are dependent on the relative concentrations. Turbulent diffusion is basically modelled by the k- model with modifications for low Reynolds number flow effects. Numerical diffusion is eliminated by a corrective scheme which is based on accurate prediction of cross-flow diffusion. The corrective scheme in a fully explicit treatment is both conservative and stable, therefore can be used in long transient calculations. The corrective scheme allows relatively large mesh sizes without introducing the false diffusion and the time step size of the same order of magnitude as the Courant limit may be used. |
| first_indexed | 2024-09-23T16:03:19Z |
| id | mit-1721.1/60620 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T16:03:19Z |
| publishDate | 2011 |
| publisher | Cambridge, Mass. : Massachusetts Institute of Technology, Energy Laboratory and Department of Nuclear Engineering, 1983 |
| record_format | dspace |
| spelling | mit-1721.1/606202019-04-12T11:48:09Z Analytical modelling of hydrogen transport in reactor containments Hydrogen transport in reactor containments, Analytical modelling of. Manno, V. Golay, M. Massachusetts Institute of Technology. Energy Laboratory. There are two diffusion processes, molecular and turbulent, which should be modelled in different ways. Molecular diffusion is modelled by Wilke's formula for the multi-component gas diffusion, where the diffusion constants are dependent on the relative concentrations. Turbulent diffusion is basically modelled by the k- model with modifications for low Reynolds number flow effects. Numerical diffusion is eliminated by a corrective scheme which is based on accurate prediction of cross-flow diffusion. The corrective scheme in a fully explicit treatment is both conservative and stable, therefore can be used in long transient calculations. The corrective scheme allows relatively large mesh sizes without introducing the false diffusion and the time step size of the same order of magnitude as the Courant limit may be used. Several validation calculations are reported. Demonstration problems include the successful reproduction of analytical or known solutions, simulation of large scale experiments and analyses of "thought experiments" which test the physical reasonableness of the predictions. In particular, simulation of hydrogen transport tests performed at the Battelle Frankfurt Institute and Hanford Engineering Development Laboratory show good agreement with measured hydrogen concentration, temperature and flow fields. The results also indicate that potential areas of improvement are enhanced computational efficiency, further reduction of numerical diffusion and development of containment spray models. Overall, a useful tool applicable to many nuclear safety problems is described. 2011-01-14T23:23:43Z 2011-01-14T23:23:43Z 1983 http://hdl.handle.net/1721.1/60620 12625922 Energy Laboratory report (Massachusetts Institute of Technology. Energy Laboratory) no. MIT-EL 83-009. 336 p application/pdf Cambridge, Mass. : Massachusetts Institute of Technology, Energy Laboratory and Department of Nuclear Engineering, 1983 |
| spellingShingle | Manno, V. Golay, M. Analytical modelling of hydrogen transport in reactor containments |
| title | Analytical modelling of hydrogen transport in reactor containments |
| title_full | Analytical modelling of hydrogen transport in reactor containments |
| title_fullStr | Analytical modelling of hydrogen transport in reactor containments |
| title_full_unstemmed | Analytical modelling of hydrogen transport in reactor containments |
| title_short | Analytical modelling of hydrogen transport in reactor containments |
| title_sort | analytical modelling of hydrogen transport in reactor containments |
| url | http://hdl.handle.net/1721.1/60620 |
| work_keys_str_mv | AT mannov analyticalmodellingofhydrogentransportinreactorcontainments AT golaym analyticalmodellingofhydrogentransportinreactorcontainments AT mannov hydrogentransportinreactorcontainmentsanalyticalmodellingof AT golaym hydrogentransportinreactorcontainmentsanalyticalmodellingof |